Lecture 9 - Åbo Akademi

Motivation
• Modern on-chip electrical interconnects (EIs) are realized
using copper wires
• On-chip EIs can be classified into two categories
• local interconnects: used for short distance communication, delay of
less than a clock cycle
• global interconnects: fewer in number, used for long distance
communication, delay spanning multiple cycles
• Long global EIs typically have high RC constants
• which results in greater propagation delay, transition time, and
crosstalk noise
• Repeater insertion and increasing wire width can reduce
the propagation delay somewhat